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e e h S. m. e e h 9N m 3 EN ,O.T| ,G NN .A LM A E M m d O M O W No. 413.907. Patented 001;. 29, 1889.

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wvcweooeo n4 PETERS. Fholnrljihogmpher, Washington. at.

"UNITED STATES VIRGIL W. 'BLANCHARl),

PATENT OFFICE.

OF NEW YORK, N. Y., ASSIGNOR TO JOSEPH A. DAVIS, OF SAME PLACE.

STEAM-ENGINE.

, SPECIFICATION forming part of Letters Patent No. 413,907, dated October 29, 1889.

Application filed April 9,1889. Serial ll'o. 306,536. (No modeLl To all whom it may concern;

Be it known that I, VIRGIL W. BLANOHARD,

of New York, in the county of New York and State of New York, have invented certain new and'useful Improvements in Steam-Engines;

and I do hereby declare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification,

in which-- Figure 1 is a plan view of the adjustable end guides for the piston-rod and the indicators at the ends 'of the cylinder, showing the cylinder, its piston, and the valves in section.

Fig. 2 is an end view of the cylinder. Fig. 3 is a cross-section through one of the piston.- rod guides, enlarged.

The objects of my invention are to provide means for truing a piston within its cylinder and to support the same independently of the cylinder, so that neither the cylinder nor the piston will wear untrue, as will be fully understood from the following description when taken in connection with the annexed drawings.

A designates the cylinder of the engine, which I prefer to make of steel and to construct very thin. The ends of this cylinder are made screw-threaded, and on them are tightly screwed rings B B, having inlet-ports O 0, provided with oscillating valves or a, and exhaust ports 0" O, and which are also provided with oscillating valves a a. The inlet and exhaust valves will be operated by a suitable cut-off mechanism regulated by a governor. To the ported rings 13 B the cylinder-headsD D are bolted, having stuffingboxes F F, which may be packed in any suitable manner. Throu h the stuffing-boxes passes the piston-rod F on which is suitably secured a piston F". I

The cylinder A above described is rigidly secured to a substantial bed or," by means of semicircular straps G, arranged beneath and above the cylinder and rigidly bolted to the said bed. On the ends of the piston-rod F are cross-heads F which reciprocate between and are supported by slideways H H, arranged and 3. Both slideways and their frames and the means for adjusting the latter are constructed exactly alike; hence a description of those at one end of the cylinder will give a full understanding of those at the opposite end of this cylinder. The slideways are slotted at b c, as indicated, and in the slots 12 are the enlarged cylindrical ends of a number of screws T, having nuts on their outer ends. The slots 0 in the slideways allow them to be adjusted vertically, the screws T being used for adjusting them horizontally independently of each other;

K K are gibs or wedges which extend transversely through slots made through the frame I, beneath the slideways, on the horizontal surfaces of which gibs the slideways have theirbearings. Through the web of the frame I oblong holes h are made vertically, and through these holes screws L pass, which are tapped through nuts L on the bottom of said web and into the lower surface edges of the slideways II. By means of the screws L the slideways are rigidly held down in their places after adjustment. It will therefore be necessary to loosen these screws before the gibs can be adjusted. The object of the gibs or wedges is to adjust the slideways vertically. These adjusting devices for the slideways are clearly shown, described, and claimed in my application for slideways for cross-heads of steam-engines filed April 9, 1889,'Serial No. 306,532, and are not herein claimed.

In order to obtain accuracy of adjustment, the outer faces of the cylinder-heads D should be exactly perpendicular to .the longitudinal axis of the piston-rod and parallel to the sides of the piston, for a reason which I shall now explain. On the piston-rod F, in close relation to the necks of the cross-heads F are secured indicators P, which respectively consist of curved arms, (preferably four,) of equal length, directed toward the cylinder-head. These arms are equidistant from each other, and their extremities or points are equidistant from the axis of the piston-rod F. These indicator-arms P are of such shape andsize and are so arranged that they do not interfere with the free passage of the cross-heads F in their slideways, and said arms;are so adjusted with respect to the strokes of the piston and outer faces of the cylinder-heads that at the terminus of each stroke of the piston the points of one or the other set of indicators will nearly touch a cylinder-head. Consequently any deviation of the piston and its rod from a true running line, or cylinder-axis, can be seen at a glance by observing the variation of distance between any one or more of the indicator-points and the piston head or heads. Such variation can be readily cor rected by adjusting the slideways vertically or horizontally, as circumstances require.

It will be observed that I am able to maintain the alignment of the piston with respect to the axis of the cylinder at all times, and also to remove the weight of the piston and its rod from the cylinder and transfer this e ht to a j bl l deways beyon th ends of the cylinder. I

Having described my invention, What I claim as w, and d s re t e ure by tt r Patent, is

1. The combinationm'ithacylinderi l Whichworks a piston, of a piston rod which extends through stuffing-boxes in the cylinder-heads, and adjustable 'slidetvays for the cross-heads on the extremities of th piston-rod, substanv tially as described.

2. The combination of indicators with acylinder and a piston-rod which is supported at both ends by adjustable slide vays, substantially as described.

3. The combination of the cylinder and its supporting bed, the piston rod extending through both cylinder-heads and bearing indicators P, slideways for supporting the crossheads of the piston-rod, and means for adjusting said slideways, all constructed and adapted .to operate substantially in the manner and for the purposes described.

4:. The combination of adjustable slideways, a piston-rod which extends through both cylinder-heads, and indicators thereon, substantially as described.

5. The combination of the cylinder and piston and piston-rod extending through both cylinder heads with frames I at the opposite ends of the cylinder, slidcways H, supporting the cross-heads of the piston-rod, the screws fQ ad s n t es ay f r z ntelly, e gibs f r ad us ing th were v i a and m a 9; seem-. 1) holding thes sideways, substa t ell in he manne an fer the w'r e d sfil' bed- In tes n hat-. claim the f reeq ug as my own I efi x y signa ure in presence We y tnesees- P WELL: P. L. Bnoorgs. 

